window.onload=function(){
    var u = navigator.userAgent,
        dpr = window.devicePixelRatio || 1;
    if (u && u != "") {
        var mobile = !!u.match(/AppleWebKit.*Mobile.*/); //是否为移动终端
        if(mobile){
            if(dpr==2){
                document.documentElement.style.fontSize="100%";
            }else if(dpr==1.5){
                document.documentElement.style.fontSize="120%";
            }else if(dpr==3){
                document.documentElement.style.fontSize="130%";
            }
            document.documentElement.setAttribute('mobile','1');
        }
    }
    document.documentElement.setAttribute('dpr',dpr);
    //alert(dpr)
    //console.log(window.location.pathname);
    var pathName = window.location.pathname;
    if(pathName.indexOf("header")>0){
        //_header.document.getElementById(pathName).className='active'; 
    }
}